Although this book is very old,( )content is very interesting. A. its B. so it C. it is D. but its
出自:乐山师范学院基础英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块